<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script type="text/javascript" src="./js/ctx.js"></script>
</head>
<body>
<div id="cesiumContainer"></div>
<script>
    var initCesium = new InitCesium();
    var viewer = initCesium.initViewer('cesiumContainer', {
        imageryProvider : new Cesium.ArcGisMapServerImageryProvider({
            url : 'https://services.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer'
        }),
        baseLayerPicker : false
    });

    var layers = viewer.imageryLayers;
    var earthAtNight = layers.addImageryProvider(new Cesium.IonImageryProvider({ assetId: 3812 }));
    earthAtNight.alpha = 0.5;
    earthAtNight.brightness = 2.0;

    layers.addImageryProvider(new Cesium.SingleTileImageryProvider({
        url : './img/igs/Cesium_Logo_overlay.png',
        rectangle : Cesium.Rectangle.fromDegrees(-75.0, 28.0, -67.0, 29.75)
    }));

</script>
</body>
</html>